MAX5479 Maxim, MAX5479 Datasheet - Page 8

• Manufacturer Part Number: MAX5479
• Description: Dual - 256-Tap/ Nonvolatile/ I2C-Interface/ Digital Potentiometers
• Manufacturer: Maxim

Dual, 256-Tap, Nonvolatile, I
Digital Potentiometers
Figure 1. I
The MAX5477/MAX5478/MAX5479 contain two resistor
arrays with 255 elements in each array. The MAX5477
has a total end-to-end resistance of 10kΩ, the
MAX5478 has an end-to-end resistance of 50kΩ, and
the MAX5479 has an end-to-end resistance of 100kΩ.
8
TSSOP
_______________________________________________________________________________________
10
11
12
13
14
—
—
1
2
3
4
5
6
7
8
9
SDA
SCL
2
PIN
C Serial-Interface Timing Diagram
t
HD:STA
THIN QFN
PARAMETERS ARE MEASURED FROM 30% TO 70%.
CONDITION
8, 16
15
14
13
12
11
10
EP
START
9
7
6
5
4
3
2
1
(S)
t
SU:DAT
Detailed Description
NAME
GND
SDA
SCL
N.C.
t
V
WA
WB
LOW
WP
HA
HB
LA
LB
A2
A1
A0
EP
DD
t
R
Potentiometer A High Terminal
Potentiometer A Wiper Terminal
Potentiometer A Low Terminal
Potentiometer B High Terminal
Potentiometer B Wiper Terminal
Potentiometer B Low Terminal
Write-Protect Input. Connect to GND to allow changes to the wiper position and the data stored
in the EEPROM. Connect to V
Ground
Address Input 2. Connect to V
Address Input 1. Connect to V
Address Input 0. Connect to V
I
I
Power-Supply Input. Connect a +2.7V to +5.25V power supply to V
with a 0.1µF capacitor installed as close to the device as possible.
No Connection. Do not connect.
Exposed Paddle. Do not connect.
t
HIGH
2
2
C Serial Data
C Clock Input
t
F
t
HD:DAT
t
SU:STA
DD
REPEATED START
DD
DD
DD
CONDITION
or leave open to enable the write protection of the EEPROM.
(SR)
or GND (see Table 1).
or GND (see Table 1).
or GND (see Table 1).
The MAX5477/MAX5478/MAX5479 provide access to
the high, low, and wiper terminals for a standard volt-
age-divider configuration. Connect H_, L_, and W_ in
any desired configuration as long as their voltages
remain between GND and V
t
HD:STA
2
FUNCTION
ACKNOWLEDGE
C-Interface,
(A)
t
SU:STO
DD
DD
CONDITION
Pin Description
.
STOP
and bypass V
(P)
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t
BUF
CONDITION
START
(S)
DD
to GND